Hidden in the middle of New York City is a secret sanctuary for demon hunters, and Lily Collins just found it.

In this exclusive preview of "Mortal Instruments: City of Bones" (below), Collin's Clary Fray has just learned she's a Shadowhunter, a half-angel warrior tasked with protecting the world from demons, one of which just gave her a nasty wound. In the clip, a fellow Shadowhunter (Jamie Campbell Bower) takes Clary to a hideaway so she can rest up (and he can shamelessly flirt).

Check out the preview below, and see all the Shadowhunter action when "Mortal Instruments: City of Bones" hits theaters August 21.